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Factors affecting the mixed-layer concentrations of singlet oxygen in sunlit lakes
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2021-06-23 , DOI: 10.1039/d1em00062d Sarah B Partanen 1 , Jennifer N Apell , Jianming Lin , Kristopher McNeill
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2021-06-23 , DOI: 10.1039/d1em00062d Sarah B Partanen 1 , Jennifer N Apell , Jianming Lin , Kristopher McNeill
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The steady-state concentration of singlet oxygen within a lake ([1O2]SS) is an important parameter that can affect the environmental half-life of pollutants and environmental fate modelling. However, values of [1O2]SS are often determined for the near-surface of a lake, and these values typically do not represent the average over the epilimnia of lakes. In this work, the environmental and physical factors that have the largest impact on [1O2]SS within lake epilimnia were identified. It was found that the depth of the epilimnion has the largest impact on depth-averaged [1O2]SS, with a factor of 8.8 decrease in [1O2]SS when epilimnion depth increases from 2 m to 20 m. The next most important factors are the wavelength-dependent singlet oxygen quantum yield relationship and the latitude of the lake, causing variations in [1O2]SS by factors of 3.2 and 2.5 respectively, over ranges of representative values. For a set of representative parameters, the depth-averaged value of [1O2]SS within an average epilimnion depth of 9.0 m was found to be 5.8 × 10−16 M and the near-surface value of [1O2]SS was found to be 1.9 × 10−14 M. We recommend a range of 6 × 10−17 to 5 × 10−15 M as being more representative of [1O2]SS values within the epilimnia of lakes globally and potentially more useful for estimating pollutant lifetimes than those calculated using [1O2]SS values that correspond to near-surface, summer midday values. This work advances our understanding of [1O2]SS inter-lake variability in the environment, and provides estimates of [1O2]SS for practitioners and researchers to assess environmental half-lives of pollutants due to reaction with singlet oxygen.
中文翻译：
影响日照湖泊中单线态氧混合层浓度的因素
湖中单线态氧的稳态浓度 ([ 1 O 2 ] SS ) 是一个重要的参数，可以影响污染物的环境半衰期和环境归宿模型。然而，[ 1 O 2 ] SS 的值通常是针对湖泊的近地表确定的，这些值通常不代表湖泊表层的平均值。在这项工作中，确定了对湖泊表层中[ 1 O 2 ] SS影响最大的环境和物理因素。结果表明，表皮深度对深度平均的影响最大[ 1 O2 ] SS，当表层深度从 2 m 增加到 20 m 时，[ 1 O 2 ] SS减少了 8.8 倍。下一个最重要的因素是与波长相关的单线态氧量子产率关系和湖泊的纬度，导致 [ 1 O 2 ] SS在代表性值范围内分别以 3.2 和 2.5倍的系数变化。对于一组有代表性的参数，发现 [ 1 O 2 ] SS在 9.0 m 的平均表层深度内的深度平均值为 5.8 × 10 -16 M，近地表值为 [ 1 O2 ] SS被发现为 1.9 × 10 -14 M。我们推荐 6 × 10 -17到 5 × 10 -15 M 的范围，因为它更能代表全球范围内湖泊流域内的[ 1 O 2 ] SS值，并且与使用 [ 1 O 2 ] SS值（对应于近地表夏季正午值）计算的那些值相比，对于估计污染物寿命可能更有用。这项工作促进了我们对环境中 [ 1 O 2 ] SS湖间变化的理解，并提供了 [ 1 O 2] SS供从业者和研究人员评估由于与单线态氧反应而导致的污染物的环境半衰期。
更新日期：2021-07-07
中文翻译：
影响日照湖泊中单线态氧混合层浓度的因素
湖中单线态氧的稳态浓度 ([ 1 O 2 ] SS ) 是一个重要的参数，可以影响污染物的环境半衰期和环境归宿模型。然而，[ 1 O 2 ] SS 的值通常是针对湖泊的近地表确定的，这些值通常不代表湖泊表层的平均值。在这项工作中，确定了对湖泊表层中[ 1 O 2 ] SS影响最大的环境和物理因素。结果表明，表皮深度对深度平均的影响最大[ 1 O2 ] SS，当表层深度从 2 m 增加到 20 m 时，[ 1 O 2 ] SS减少了 8.8 倍。下一个最重要的因素是与波长相关的单线态氧量子产率关系和湖泊的纬度，导致 [ 1 O 2 ] SS在代表性值范围内分别以 3.2 和 2.5倍的系数变化。对于一组有代表性的参数，发现 [ 1 O 2 ] SS在 9.0 m 的平均表层深度内的深度平均值为 5.8 × 10 -16 M，近地表值为 [ 1 O2 ] SS被发现为 1.9 × 10 -14 M。我们推荐 6 × 10 -17到 5 × 10 -15 M 的范围，因为它更能代表全球范围内湖泊流域内的[ 1 O 2 ] SS值，并且与使用 [ 1 O 2 ] SS值（对应于近地表夏季正午值）计算的那些值相比，对于估计污染物寿命可能更有用。这项工作促进了我们对环境中 [ 1 O 2 ] SS湖间变化的理解，并提供了 [ 1 O 2] SS供从业者和研究人员评估由于与单线态氧反应而导致的污染物的环境半衰期。
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